Created attachment 160264 [details] image of jagged lines SUMMARY *** NOTE: If you are reporting a crash, please try to attach a backtrace with debug symbols. See https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports *** The longer a line is held down using a drawing tablet, the more frayed the line seems to become. Using a Huion Inspiroy H610PROV2. Works fine on Gimp / Xournal++. STEPS TO REPRODUCE 1. Open any pdf on okular (on windows) 2. Draw a line using the freehand line tool (alt + 8) OBSERVED RESULT See image EXPECTED RESULT smooth lines and circles SOFTWARE/OS VERSIONS Windows: Windows 11 22H2, Build 22621.1992 KDE Plasma Version: n/a (?) KDE Frameworks Version: n/a (?) Qt Version: unsure (where do I find this) ADDITIONAL INFORMATION
I can reproduce this issue in both Windows 10 and Windows 11 using a Wacom Intuos tablet (with the latest driver). Interestingly, the same issue does not exist when using the Linux (Ubuntu) version of Okular. I suspect this is a platform-specific issue. Related: - https://bugs.kde.org/show_bug.cgi?id=410723 - https://stackoverflow.com/q/31172532
I can reproduce this issue as well. I use Windows 11 on a Samsung Galaxy Book Pro 360 with a Samsung Pen. Samsung uses Wacom tech and drivers, so the nature of the issue is similar to those with drawing tablets.
Related: Bug 437401
I am also experiencing this same issue with my HP tablet 11 running Windows 11 with a HP active pen (I don't think it uses Wacom technology), also the lines take some processing before they do appear, there is probably some problem with the input filtering that instead of ignoring the majority of the signals to produce a smooth line with a small amount of points, the program seems to be including all the input data with its respective noise, which is generating this spiked/jagged effect on the lines.